R/wrappers.r

In wtcooper/dplyrStrWrap: Names as Strings for dplyr Methods

# Helper functions that allow string arguments for  dplyr's data modification functions like arrange, select etc. 
# Author: Sebastian Kranz
# https://gist.github.com/skranz/9681509


# Examples are below

#' Modified version of dplyr's filter that uses string arguments
#' @export
s_filter = function(.data, ...) {
	eval.string.dplyr(.data,"filter", ...)
}

#' Modified version of dplyr's select that uses string arguments
#' @export
s_select = function(.data, ...) {
	eval.string.dplyr(.data,"select", ...)
}

#' Modified version of dplyr's arrange that uses string arguments
#' @export
s_arrange = function(.data, ...) {
	eval.string.dplyr(.data,"arrange", ...)
}

#' Modified version of dplyr's arrange that uses string arguments
#' @export
s_mutate = function(.data, ...) {
	eval.string.dplyr(.data,"mutate", ...)
}

#' Modified version of dplyr's summarise that uses string arguments
#' @export
s_summarise = function(.data, ...) {
	eval.string.dplyr(.data,"summarise", ...)
}

#' Modified version of dplyr's group_by that uses string arguments
#' @export
s_group_by = function(.data, ...) {
	eval.string.dplyr(.data,"group_by", ...)
}

#' Internal function used by s_filter, s_select etc.
eval.string.dplyr = function(.data, .fun.name, ...) {
	args = list(...)
	args = unlist(args)
	code = paste0(.fun.name,"(.data,", paste0(args, collapse=","), ")")
	df = eval(parse(text=code,srcfile=NULL))
	df  
}